91403161 has 2 divisors, whose sum is σ = 91403162. Its totient is φ = 91403160.

The previous prime is 91403131. The next prime is 91403201. The reversal of 91403161 is 16130419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89019225 + 2383936 = 9435^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 91403161 - 2¹⁷ = 91272089 is a prime.

It is the 9561-st Hogben number.

It is not a weakly prime, because it can be changed into another prime (91403131) by changing a digit.

It is a nontrivial repunit in base 9560.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45701580 + 45701581.

It is an arithmetic number, because the mean of its divisors is an integer number (45701581).

Almost surely, 2^91403161 is an apocalyptic number.

It is an amenable number.

91403161 is a deficient number, since it is larger than the sum of its proper divisors (1).

91403161 is an equidigital number, since it uses as much as digits as its factorization.

91403161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 91403161 is about 9560.5000392239. The cubic root of 91403161 is about 450.4574130835.

The spelling of 91403161 in words is "ninety-one million, four hundred three thousand, one hundred sixty-one".